Installation

If you would like to contribute to Dallinger, please follow these alternative install instructions.

Install Python

Dallinger is written in the language Python. For it to work, you will need to have Python 2.7 installed. You can check what version of Python you have by running:

python --version

If you do not have Python 2.7 installed, you can install it from the Python website.

Install Postgres

Dallinger uses Postgres to create local databases. On OS X, install Postgres from postgresapp.com. This will require downloading a zip file, unzipping the file and installing the unzipped application.

You will then need to add Postgres to your PATH environmental variable. If you use the default location for installing applications on OS X (namely /Applications), you can adjust your path by running the following command:

export PATH="/Applications/Postgres.app/Contents/Versions/9.3/bin:$PATH"

NB: If you have installed a more recent version of Postgres (e.g., the the upcoming version 9.4), you may need to alter that command slightly to accommodate the more recent version number. To double check which version to include, then run:

ls /Applications/Postgres.app/Contents/Versions/

Whatever number that returns is the version number that you should place in the export command above. If it does not return a number, you have not installed Postgres correctly in your /Applications folder or something else is horribly wrong.

Create the Database

After installing Postgres, you will need to create a database for your experiments to use. Run the following command from the command line:

psql -c 'create database dallinger;' -U postgres

Install Dallinger

Install Dallinger from the terminal by running

pip install dallinger[data]

Test that your installation works by running:

dallinger --version

If you use Anaconda, installing Dallinger probably failed. The problem is that you need to install bindings for the psycopg2 package (it helps Python play nicely with Postgres) and you must use conda for conda to know where to look for the links. You do this with:

conda install psycopg2

Then, try the above installation commands. They should work now, meaning you can move on.

Next, you’ll need access keys for AWS, Heroku, etc..

Install Heroku

To run experiments locally or on the internet you need Heroku installed. You need at least version 3.28.0 to use Dallinger. You only need a Heroku account to launch experiments on the internet, you do not need it for local debugging.

You can check your currently installed version by running:

heroku --version

Heroku is available for download from heroku.com.

Install redis

Accurate debugging of experiments also requires you to have redis installed. If this is not installed you may find that local participant data does not get updated as you progress through the experiment.

You can find installation instructions at redis.com.